Man page of "ld" is not correct. Reproducible: Always Steps to Reproduce: 1.man ld or ld --help 2.check z *keyword* 3. Actual Results: z *keyword* is displayed. z,*keyword* should be displayed.
emerge --info is not necesesary. binutils version 2.18. z,*keyword* is correct. Actually z *keyword* is displayed in info/man ld and ld --help.
You need to ask upstream to get this fixed - http://sourceware.org/bugzilla/
Bug reported to sourceware.